Java for LeetCode 235 Lowest Common Ancestor of a Binary Search Tree

递归实现如下:

    public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
    	if(p.val>root.val&&q.val>root.val)
    		return lowestCommonAncestor(root.right,p,q);
    	else if(p.val<root.val&&q.val<root.val)
    		return lowestCommonAncestor(root.left,p,q);   
        return root;
    }